JPH0389672A - Picture reader - Google Patents

Abstract

PURPOSE:To attain adjustment easily within a short time by arranging a direction regulation member supporting a scanning moving body onto a moving guide member on the scanning moving body of a read face side of a read element and providing the direction regulation member to be displaced at a right angle to the moving direction of the scanning moving body. CONSTITUTION:When the adjustment is implemented by using an adjustment check jig, a moving body 1 is removed from a reference rail 6 to support a sensor 2 to be directed upward and a rod jig member is fitted to the moving body 1 so that the jig is in the same state as that of the reference rail 6 and the guide rail 7. while two microscopes are used for the check, an adjustment plate 8 is turned little by little by turning an eccentric rod 51 inserted to an adjustment long hole 18 and a small diameter hole 19 to apply the adjustment that the angle of the sensor 2 is a right angle with respect to the subscanning direction. Since the adjustment plate for the arrangement and adjustment is provided for the sensor 2 on the moving body 1 for the photodetecting face side of the sensor 2, the adjustment is implemented while observing the line of the sensor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image reading device such as a film reader that scans and reads a projected image using, for example, a line image sensor.

(Prior Art) Conventionally, as this type of image reading device, there is one as shown in FIG. 6, for example. In FIG. 102 is a rail 103 as a movement guide member
By moving in the six directions of arrows or in the direction of arrow B along lines a and 103b, the image projected on the reading surface of the line image sensor 101 is scanned and read.

The line image sensor 101 is attached to the back side of the substrate 104 in the figure, and the substrate 104 is attached to the support plate 10.
It is fixed to 5. The support plate 105 fits into a rotation center pin 106 fixed to the movable body 102, and is rotatably supported on the movable body 102 via spacers 107a, 107b, and 107c.

The movable body 102 has a bearing 108 attached to the rail 103a and slidable in the axial direction thereof, and a slide member 109 that slides in contact with the upper surface of the rail 103b, at the lower part thereof.
/-) Ltl O3a, 103 bG: Therefore, the height of the moving body 102 is defined. Further, a coupling member 102a coupled to the wire 110 is provided at the end of the moving body 102 on the bearing 108 side, and the wire 110 is driven by the operation of a wire reciprocating drive mechanism (not shown), and the moving body 102 is It moves in the axial direction (sub-scanning direction) of the rail 103a.

The line direction C (main scanning direction) of the line image sensor 101 is perpendicular to the rail 103a, and the light image projected from the bottom of the device in the figure passes through an opening (not shown) of the moving body 102. An image is formed on the line image sensor 101 and scanned in the main scanning direction, and the line image sensor 101 is transferred to the rail 103 along with the moving body 102.
By moving along a, the image is scanned in the sub-scanning direction.

In such an image reading device, if the perpendicularity between the scanning movement direction (sub-scanning direction) of the movable body 102 and the line direction (main-scanning direction) of the line image sensor 101 is lost due to stacking of component precision, the read image may be distorted. Since the perpendicularity is also impaired and the read image quality is degraded, it is necessary to adjust the perpendicularity. In this case, by rotating the screw of the screw mechanism 111 that fixes the support plate 105 on the movable body 102, the support plate 105 is
5 on the movable body 102 about the rotation center bin 106, and the line image sensor 101 is placed at an appropriate position to adjust the perpendicularity.

At this time, the rail 103a is usually fixed to the main body of the device, and when performing the above adjustment, the adjustment is performed by rotating the support plate 105 while the movable body 102 is connected to the rail 103a. The screws and fixing screws are for moving body 1.
02, the exposed side of the line image sensor 101 is on the opposite side, so the line image sensor
It is difficult to perform the above-mentioned adjustment work while directly observing the line, and furthermore, since an optical system such as a mirror is close to the lower part of the movable body 102, it is impossible to insert a jig.

Therefore, adjustment work is performed while projecting a special original image and observing the output signal of the line image sensor 101.
For example, when using a document in which a pattern of two points lined up at a predetermined interval in the ideal main scanning direction is recorded, the line image sensor 101 simultaneously detects two dots while moving the movable body 102 along the rail 103a. If one point can be detected, it is assumed that the line direction of the line image sensor 101, that is, the main scanning direction, is perpendicular to the sub-scanning direction, and the above adjustment operation is performed.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned conventional technology, the moving body 102 must be moved in the sub-scanning direction and the above-mentioned determination work must be performed every time the adjustment screw is rotated. So,
There was a problem that the adjustment work was complicated and time consuming.

Also, a support plate 1 supporting the line image sensor 101 is provided.
05 is configured as a separate part from the moving body 102,
The parallelism with the rail 103a, that is, the parallelism between the imaging plane of the image and the line image sensor 101, is often distorted due to the dimensional accuracy of the parts, especially when projecting an optical image using a projection lens with a shallow depth of field. However, there was a drawback that the read image was often blurred on one side.

Furthermore, the support plate 105 is the substrate 1 of the line image sensor.
04, and when the wire 110 is driven by a stepping motor or the like, it tends to resonate at a specific driving speed. Another drawback was that it often caused blurring and noise.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to provide an image reading device that can facilitate adjustment work and improve the quality of read images.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, an image is scanned and read by moving a scanning moving body to which a reading element is fixed along a movement guide member. In the image reading device, on the scanning moving body on the reading surface side of the reading element,
A direction regulating member is installed that supports the scanning movable body on the movable guiding member by sandwiching the movable guiding member, and the direction regulating member is provided so as to be displaceable in a direction perpendicular to the moving direction of the scanning movable body. It is characterized by becoming.

The scanning movable body may be detachably attached to the movement guide member.

The direction regulating member may include a first direction regulating member that contacts the movement guide member at at least two places, and a movement guide that is always biased in a direction to press the movement guide member against the first direction regulating member. A structure comprising a second direction regulating member that contacts the member is preferable.

(Function) In the device of the present invention having the above configuration, since the direction regulating member is provided on the scanning moving body on the reading surface side of the reading element, the direction regulating member is displaced while visually observing the reading element. The position of the scanning movable body relative to the movement guide member, that is, the position of the reading element can be adjusted.

Furthermore, by making the scanning movable body detachable from the movement guide member, the scanning movable body can be removed from the movement guide member and adjustment work can be performed using a jig or the like.

Furthermore, the device of the present invention does not require a support plate for supporting the reading element on the scanning moving body, so the structure is simplified and optical stability and mechanical dynamic stability are improved. I can do it.

(Example) The present invention will be explained below based on the illustrated example. 1st
The figure is a view of the reading scanning system of an image reading device according to an embodiment of the present invention viewed diagonally from below. A sensor (hereinafter referred to as sensor) 2 is fixed and receives image light projected from below. The lead portion of the sensor 2 passes through an escape hole (not shown) on the back side of the sensor 2 on the lower surface of the moving body 1, and is connected to a CCD drive board (not shown) fixed inside the moving body 1. Thereby, electrical signals are transmitted and received.

Openings 1a, lb, and lc are provided on the lower surface of the moving body 1, and rollers 3, 4.5 rotatably mounted inside the moving body 1 are exposed through the openings la, lb, and lc, respectively. ing. Each roller 3°4.5 can rotate by contacting the upper generatrix of a cylindrical reference rail 6 and a guide rail 7 as movement guide members fixed to the main body of the device, and at this time, the projected image The imaging plane and the reading plane of the sensor 2 are made to coincide.

An adjustment plate 8 is further provided on the lower surface of the moving body 1.
The adjustment plate 8 fits into a rotation center pin 9 fixed to the lower surface of the movable body 1, and can rotate about the rotation center pin 9 in a plane parallel to the lower surface of the movable body 1. Further, a shaft 10.11 is fixed to the front and rear ends of the adjustment plate 8, and rollers 12 and 13 as first direction regulating members are respectively attached to the shaft 10.11 at positions where they contact the lateral generatrix of the reference rail 6. It is rotatably supported.

This adjustment plate 8 is provided with an elongated adjustment hole 18, and a small diameter hole 19 is provided on the lower surface of the movable body 1 at a position that substantially overlaps with the elongated adjustment hole 18. On the other hand, the eccentric rod 51
has a small diameter part 51a that can fit into the small diameter hole 19, and a large diameter part 51b that can fit in the short and long widths of the adjustment long hole 18, and the small diameter part 51a is inserted into the small diameter hole 19 to form an eccentric rod. By rotating 51, the large diameter portion 51b can be brought into contact with the side surface of the adjustment elongated hole 18, and the adjustment plate 8 can be rotated about the rotation center pin 9. Further, the adjustment plate 8 is provided with elongated holes 14 and 15 having a long diameter in a direction perpendicular to the reference rail 6, and screws 16° 17 are inserted into the elongated holes 14 and 15, respectively.
15 into a screw hole (not shown) on the lower surface of the movable body 1, the adjustment plate 8 is fixed onto the movable body 1.

An arm shaft 20 is fixed near the intermediate position of the rollers 1, 2, and 13 on the lower surface of the moving body 1, and a shaft 22 is held at the free end side of the arm 21, which is rotatably supported by the arm shaft 20. A roller 23 serving as a second direction regulating member is rotatably supported on this. The rollers 23 are arranged so as to be in contact with the lateral generatrix on the opposite side from the rollers 12 and 13 with respect to the reference rail 6. The torsion coil spring 24 fitted into the arm shaft 20 has one end locked in a hole 25 provided on the lower surface of the moving body 1, and the other end acts on the side surface 21a of the arm 21. Torsion coil spring 24
urges the rollers 23 in the direction of pressing them against the reference rail 6.

The moving body 1 is supported on the reference rail 6 by the rollers 12, 13 and the rollers 23 sandwiching the reference rail 6 from both sides.

When reading an image with an image reading device having a reading scanning system configured as described above, the movable body 1 is moved along the reference rail 6 and the guide rail 7 as in the conventional example shown in FIG. The projected image is scanned in the sub-scanning direction by moving the projection image, and the image is read by the sensor 2.

Next, the operation when adjusting the angle of the line direction (main scanning direction) of the sensor 2 with respect to the sub-scanning direction will be described.

For example, adjustment work is carried out using an adjustment inspection jig that has a rod-shaped member corresponding to the reference rail 6 and the guide rail 7, and to which two microscopes are fixed, which are arranged at a predetermined interval in a direction perpendicular to the rod-shaped member. When performing this, remove the moving body 1 from the reference rail 6 and hold it so that the sensor 2 faces upward,
The rod-shaped member of the jig is attached to the movable body 1 so as to be in the same state as the reference rail 6 and guide rail 7.

When the light-receiving element of sensor 2 can be viewed simultaneously with the two microscopes on the jig, the line direction of sensor 2 is perpendicular to the sub-scanning direction, so the inspection with the two microscopes can be performed. While doing so, open the adjustment slot 18. By rotating the eccentric rod 51 inserted into the small diameter hole 19, the adjustment plate 8 is rotated little by little, and the angle of the sensor 2 with respect to the sub-scanning direction is adjusted to be perpendicular.

At this time, as the angle of the adjusting plate 8 changes, the roller 23
Although the contact position between the roller 23 and the reference rail 6 changes slightly, the roller 23 is pressed against the reference rail 6 by the urging force of the torsion coil spring 24 via the rotating arm 21, so the displacement is absorbed and the roller 12 , 13 and Koro 2
3 will not interfere with the configuration in which the reference rails 6 are sandwiched from both sides to support the movable body 1.

In the above embodiment, the moving body l on the light receiving surface side of the sensor 2
Since an adjustment plate is provided on the top for adjusting the placement of the sensor 2, adjustment work can be performed while visually checking the line of the sensor 2.Moreover, the movable body 1 can be removed from the reference rail 6 and used with a jig. Adjustments can be made, so
Adjustment work can be done easily in a short time. Also,
Since there is no need to provide a support plate as shown in the conventional example above, the configuration is simplified, and the parallelism between the reading surface of the sensor 2 and the image formation surface of the projected image is improved, so that one-sided blurring of the read image can be avoided. This prevents image blurring and noise due to resonance of the support plate.

In the above embodiment, the rollers 12.13 and 23
The rollers 23 are placed in a position where they sandwich the reference rail 6 from both sides, but as shown in FIG. To,
The arrangement shown in FIG. 2 may be such that the rollers 12 and 13 are arranged on the opposite side of the reference rail 6 from that in the above embodiment, and the rollers 23 are urged in the direction of the arrow to press against the guide rail 7. When the distance between the two rails is wide, the rollers 23 can prevent the moving body 1 from tilting due to a height error between the two rails. The arrangement shown in FIG. 3 is suitable when the distance between both rails cannot be increased.

Here, in FIG. 4, the rotation center bin 9 of the adjustment plate 8 is at a distance X+L from the center a of the sensor 2 in the main scanning direction.

In Figure 0, which is an explanatory diagram showing the arrangement when the sensor is located on a dot separated by a distance Y in the sub-scanning direction, L indicates the distance from the center of the sensor 2 to the generatrix R of the reference rail 6. Koro 12,
13 is in contact with the bus line R of the reference rail 6. If the sensor 2 is tilted by an angle θ with respect to the ideal main scanning direction, if the adjusting plate 8 is rotated and adjusted, the adjusted base 1iR' of the reference rail 6 and the center a of the sensor 2 can be adjusted. The distance L' between the two changes slightly, and in this arrangement example, the amount of change Δ includes terms related to X and Y, as shown below (1)
Expressed by the formula.

π=gh/cosθ-dh=X (1/cosθ-
1) de= df/lanθ1Ix(1-CO8θ)/
sinθci=Ltanθ bc= (ci+id+de) X sinθ= (
Ltanθ+Y◆x(1-casO)/sin θ)X
sin θ= L X ridge up, Ys in e
+X (1-cos e ) COS θ +X (1-casO) = L cos θ-Ysin θ-X (1-casO)) , °, Δ=l-1' = L (1-casO)
+Y sin θ + This positional deviation can be reduced to a minimum by the arrangement described below.

FIG. 5 is an explanatory diagram showing a state in which the rotation center pin 9 of the adjustment plate 8 is placed on the intersection of the extension line of the sensor 2 line and the generatrix where the rollers 12, 13 contact the reference rail 6. If the sensor 2 is tilted by an angle θ with respect to the ideal main scanning direction, the distance between the generatrix and the center of the sensor 2 after adjustment will change slightly, but the amount of change Δ will be: Δ
=l-1' =L (1-casO), and if θ is not large (if within the normal dimensional error range), the amount of change Δ is small. In other words, since the relative positional relationship between the reference rail 6 and the imaged image is constant due to the structure of the main body, by reducing the amount of change Δ, the deviation in the main scanning direction of the image read by the sensor 2 can be minimized. can be reduced.

In the above embodiment, the rollers 12 and 13, which are rotatably provided as the first direction regulating member, are used as the second direction regulating member, and the roller 23, which is biased by the torsion coil spring 24 via the arm 21, is used as the second direction regulating member. However, the present invention is not limited to this. For example, a sliding member with low frictional resistance may be used as the first direction regulating member, and a sliding member with low frictional resistance may be used as the second direction regulating member. A member movable linearly in a direction perpendicular to the rail or a member having a simple leaf spring structure may also be used.

(Effects of the Invention) The present invention has the above-described configuration and operation, and furthermore, by providing a direction regulating member for adjustment on the scanning moving body on the reading surface side of the reading element, the scanning moving body can be further guided in movement. By making it detachable from the member, adjustment work can be easily performed in a short time.

In addition, since there is no need to provide a support plate to support the reading element on the scanning moving body, the configuration is simplified, and the parallelism between the reading surface of the reading element and the imaging plane of the image is improved, so that the read image One-sided blurring of the image is prevented, and image blur and noise due to resonance of the support plate are also prevented.

Therefore, in the apparatus of the third aspect of the present invention, the quality of the read image can be improved.

[Brief explanation of drawings]

FIG. 1 is a view of a reading scanning system of an image reading device according to an embodiment of the present invention, viewed diagonally from below, and FIGS. 2 and 3 are explanatory diagrams showing other examples of the arrangement of rollers in the same embodiment. , Fig. 4 is an explanatory diagram showing an example of the positional relationship between the reference rail and the sensor in the same embodiment, and Fig. 5 is an explanatory diagram showing an example of the positional relationship between the reference rail and the sensor in the same embodiment. FIG. 6 is a perspective view showing the configuration of a reading scanning system of a conventional image reading apparatus. Explanation of symbols 1... Moving body (scanning moving body) 2... COD line image sensor (reading element 6...
・Reference rail (movement guide member) 7... Guide rail 8... Adjustment plate 12.13
... Roller (first direction regulating member) 21... Arm 23... Roller (second direction regulating member) 24... Torsion coil spring

Claims (3)

[Claims] (1) In an image reading device that scans and reads an image by moving a scanning movable body to which a reading element is fixed along a movement guide member, the scanning movable body on the reading surface side of the reading element is A direction regulating member is installed that supports the scanning movable body on the moving guide member by sandwiching the guide member,
An image reading device characterized in that the direction regulating member is provided so as to be displaceable in a direction perpendicular to the moving direction of the scanning movable body. (2) The image reading device according to claim 1, wherein the scanning movable body is detachably attached to the movement guide member. (3) The direction regulating member includes a first direction regulating member that contacts the movement guide member at at least two places, and a movement guide member that is always biased in a direction to press the movement guide member against the first direction regulating member. 3. The image reading device according to claim 2, further comprising a second direction regulating member in contact with the second direction regulating member.